[#1608] config: Add QoS section and config

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

config/example/node.env

@@ -225,3 +225,6 @@ FROSTFS_MULTINET_SUBNETS_1_SOURCE_IPS="10.78.70.185 10.78.71.185"
 FROSTFS_MULTINET_BALANCER=roundrobin
 FROSTFS_MULTINET_RESTRICT=false
 FROSTFS_MULTINET_FALLBACK_DELAY=350ms
+
+FROSTFS_QOS_CRITICAL_AUTHORIZED_KEYS="035839e45d472a3b7769a2a1bd7d54c4ccd4943c3b40f547870e83a8fcbfb3ce11 028f42cfcb74499d7b15b35d9bff260a1c8d27de4f446a627406a382d8961486d6"
+FROSTFS_QOS_INTERNAL_AUTHORIZED_KEYS="02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2 031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a"

config/example/node.json

@@ -305,5 +305,19 @@
     "balancer": "roundrobin",
     "restrict": false,
     "fallback_delay": "350ms"
+  },
+  "qos": {
+    "critical": {
+      "authorized_keys": [
+        "035839e45d472a3b7769a2a1bd7d54c4ccd4943c3b40f547870e83a8fcbfb3ce11",
+        "028f42cfcb74499d7b15b35d9bff260a1c8d27de4f446a627406a382d8961486d6"
+      ]
+    },
+    "internal": {
+      "authorized_keys": [
+        "02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2",
+        "031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a"
+      ]
+    }
   }
 }

config/example/node.yaml

@@ -270,3 +270,13 @@ multinet:
   balancer: roundrobin
   restrict: false
   fallback_delay: 350ms
+
+qos:
+  critical:
+    authorized_keys:  # list of hex-encoded public keys that have rights to use `critical` IO tag
+      - 035839e45d472a3b7769a2a1bd7d54c4ccd4943c3b40f547870e83a8fcbfb3ce11
+      - 028f42cfcb74499d7b15b35d9bff260a1c8d27de4f446a627406a382d8961486d6
+  internal:
+    authorized_keys:  # list of hex-encoded public keys that have rights to use `internal` IO tag
+      - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
+      - 031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a